Mn-doped CsPbCl3 nanocrystals (Mn: CsPbCl3 NCs) to improve perovskite’s properties is becoming an important strategy. Here, we demonstrate a modified supersaturated recrystallization route to synthesize the high-quality Mn: CsPbCl3 NCs at room-temperature. Unprecedentedly, sulfonate ligands with various concentrations can successfully tune the dual-color emission of Mn: CsPbCl3 NCs. Ultrafast transient absorption studies unveil that the host-to-dopant internal energy transfer process involves the mediated traps. Interestingly, the dual-color emission is tuned via stabilizing the mediated traps with a small amount of ligand (the prior band edge (BE) emission reduces and Mn2+ emission increases), passivating the deep traps with a large amount ligand (both BE and Mn2+ emission increase) and destroying Mn: CsPbCl3 NCs with too much ligand (both BE and Mn2+ emission are quenched). Furthermore, the ligand tuning Mn2+ emission exhibits quenching for Cu2+ with high sensitivity and selectivity, which is explained by DFT studies. Our work not only provides a new strategy to prepare Mn-doped perovskite NCs with improved optical properties, but also presents the potential application of perovskite NCs in optical detector.
ligand tuning emission, Mn-doped CsPbCl3 NCs, sulfonates, Cu2+ probe
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